收藏本站

ADE7752/ADE7752A
TYPICAL CONNECTION DIAGRAMS
CURRENT CHANNEL CONNECTION
Figure 19 shows a typical connection diagram for the current
channel (IA). A current transformer (CT) is the current trans-
ducer selected for this example. Notice the common-mode
voltage for the current channel is AGND and is derived by
center tapping the burden resistor to AGND. This provides the
complementary analog input signals for IAP and IAN. The CT
turns ratio and burden resistor Rb are selected to give a peak
METER CONNECTIONS
In 3-phase service, two main power distribution services exist:
3-phase 4-wire or 3-phase 3-wire. The additional wire in the
3-phase 4-wire arrangement is the neutral wire. The voltage
lines have a phase difference of ±120° (±2π/3 radians) between
each other. See Equation 5.
V A ( t ) = 2 × V A × cos ( ω l t )
IAP
± 500mV
V B ( t ) = 2 × V B × cos ? ? ω l t +
V C ( t ) = 2 × V C × cos ? ? ω l t +
?
?
differential voltage of ±500 mV at maximum load.
Rf
CT
Cf
IAN
R b
?
?
2 π ?
3 ?
4 π ?
3 ?
(5)
where V A , V B , and V C represent the voltage rms values of the
IP
Rf
Cf
B
PHASE NEUTRAL
Figure 19. Typical Connection for Current Channels
VOLTAGE CHANNELS CONNECTION
different phases.
The current inputs are represented by Equation 6.
I A ( t ) = 2 I A × cos ( ω l t + φ A )
I B ( t ) = 2 I B × cos ? ? ω l t + + φ B ? ?
Figure 20 shows two typical connections for the voltage
channel. The first option uses a potential transformer (PT) to
? 3 ?
2 π
(6)
I C ( t ) = 2 I C × cos ? ? ω l t + + φ C ? ?
where I A , I B , and I C represent the rms value of the current of
each phase and ? A , ? B , and ? C represent the phase difference of
provide complete isolation from the main voltage. In the second
option, the ADE7752 is biased around the neutral wire, and a
resistor divider is used to provide a voltage signal proportional
to the line voltage. Adjusting the ratio of Ra, Rb, and VR is also
a convenient way of carrying out a gain calibration on the meter.
4 π
? 3 ?
B
B
the current and voltage channel of each phase.
PT
Rf
VAP
± 500mV
Rf
Cf
VN
The instantaneous powers can then be calculated as follows:
P A ( t ) = V A ( t ) × I A ( t )
P B ( t ) = V B ( t ) × I B ( t )
PHASE NEUTRAL
AGND
Cf
B B B
P C ( t ) = V C ( t ) × I C ( t )
P B ( t ) = V B B × cos ( φ B ) ? V B × I B × cos ? 2 ω l t + + φ B ? (7)
× I
Ra *
Rb *
VR *
Cf
± 500mV
Rf
VAP
VN
Then:
P A ( t ) = V A × I A × cos ( φ A ) ? V A × I A × cos ( 2 ω l t + φ A )
4 π
? 3 ?
P C ( t ) = V C × I C × cos ( φ C ) ? V C × I C × cos ? ? 2 ω l t +
+ φ C ? ?
PHASE NEUTRAL
* Ra >> Rf + VR; * Rb + VR = Rf
Cf
?
8 π
3
?
total real power information, P ( t ) = P A ( t ) + P B ( t ) + P C ( t ).
Figure 20. Typical Connections for Voltage Channels
As shown in Equation 7, in the ADE7752, the real power calcu-
lation per phase is made when current and voltage inputs of one
phase are connected to the same channel (A, B, or C). Then the
summation of each individual real power calculation gives the
B
Rev. C | Page 15 of 24
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
EVAL-ADE7753ZEB BOARD EVALUATION AD7753
EVAL-ADE7754EBZ BOARD EVALAUTION FOR ADE7754
EVAL-ADE7755ZEB BOARD EVALUATION FOR AD7755
EVAL-ADE7758ZEB BOARD EVAL FOR AD7758
EVAL-ADE7759EBZ BOARD EVALUATION FOR ADE7759
EVAL-ADE7762EBZ BOARD EVALUATION FOR ADE7762
EVAL-ADE7763ZEB BOARD EVALUATION FOR ADE7763
EVAL-ADE7816EBZ BOARD EVALUATION FOR ADE7816
相关代理商/技术参数
EVAL-ADE7752EB 制造商:AD 制造商全称:Analog Devices 功能描述:Three Phase Energy Metering IC with Pulse Output
EVAL-ADE7753ZEB 功能描述:BOARD EVALUATION AD7753 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-ADE7754EB 制造商:Analog Devices 功能描述:EVALUATION BOARD FOR POWER METERING, POLYPHASE MULTIFUNCTION ENERGY METERING IC WITH SERIAL PORT 制造商:Analog Devices 功能描述:PWR METERING, POLYPHASE MULTIFUNCTION ENERGY METERING IC W/ - Bulk
EVAL-ADE7754EBZ 功能描述:BOARD EVALAUTION FOR ADE7754 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081
EVAL-ADE7755EB 制造商:Analog Devices 功能描述:EVAL BOARD ENERGY METERINGW/PULSE OUTPUT - Bulk
EVAL-ADE7755EBZ 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with Pulse Output
EVAL-ADE7755EBZ1 制造商:AD 制造商全称:Analog Devices 功能描述:Energy Metering IC with Pulse Output
EVAL-ADE7755ZEB 功能描述:BOARD EVALUATION FOR AD7755 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081